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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/17/2025 2:10 PM, David Hildenbrand wrote: > On 17.04.25 08:06, Shivank Garg wrote: >> Export folio_expected_refs() to allow filesystem-specific migration >> handlers like JFS metapage_migrate_folio to properly verify reference >> counts before migration. >> >> Signed-off-by: Shivank Garg >> --- >>   include/linux/migrate.h | 1 + >>   mm/migrate.c            | 3 ++- >>   2 files changed, 3 insertions(+), 1 deletion(-) >> >> diff --git a/include/linux/migrate.h b/include/linux/migrate.h >> index aaa2114498d6..cb31c5b1eb6a 100644 >> --- a/include/linux/migrate.h >> +++ b/include/linux/migrate.h >> @@ -60,6 +60,7 @@ struct movable_operations { >>   /* Defined in mm/debug.c: */ >>   extern const char *migrate_reason_names[MR_TYPES]; >>   +int folio_expected_refs(struct address_space *mapping, struct folio *folio); >>   #ifdef CONFIG_MIGRATION >>     void putback_movable_pages(struct list_head *l); >> diff --git a/mm/migrate.c b/mm/migrate.c >> index 6e2488e5dbe4..0f01b8a87dec 100644 >> --- a/mm/migrate.c >> +++ b/mm/migrate.c >> @@ -445,7 +445,7 @@ void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd) >>   } >>   #endif >>   -static int folio_expected_refs(struct address_space *mapping, >> +int folio_expected_refs(struct address_space *mapping, >>           struct folio *folio) >>   { >>       int refs = 1; >> @@ -458,6 +458,7 @@ static int folio_expected_refs(struct address_space *mapping, >>         return refs; >>   } >> +EXPORT_SYMBOL_GPL(folio_expected_refs); >>     /* >>    * Replace the folio in the mapping. > > Can we make that an inline function instead, and add some documentation? > > This function is only suitable if we know the folio is unmapped from page tables (no references from page table mappings: !folio_mapped()). > > So when exporting this function we either > > a) Need a clearer name > > b) Should generalize it to consider folio_mapcount() etc, and lookup the >    mapping from the folio. > > For your use case, a) might be easier. Maybe call  it something like "folio_migration_expected_refs" ? > Thank you David for the review. I'll make it a static inline function in the header file with proper documentation. I don't need to EXPORT it then, since it will be an inline function. Best Regards, Shivank